Seismic conduit joint connector

ABSTRACT

A system includes a conduit and a gasket assembly. The conduit includes a body and has a bell defining an opening disposed at one end of the conduit. The bell includes a ridge defining a circumferential internal groove, a sloping portion defining an internal recessed area and disposed adjacent to the ridge, and an abutment end inwardly extending from the sloping portion in a direction that is perpendicular to a central axis defined by the bell. The gasket assembly is disposed within the internal groove. The gasket assembly includes a plurality of gripping inserts each comprising a hollow body and an elastomeric gasket having a circular shape and being disposed within the hollow bodies defines by the plurality of gripping inserts.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a national phase entry under 35 U.S.C. §371 ofinternational patent application PCT/US2013/061806, and claims priorityto U.S. Provisional Patent Application No. 61/705,811, filed Sep. 26,2012, the entireties of which are herein incorporated by reference.

FIELD OF DISCLOSURE

The disclosed system and method relate to pipe joints and fittings. Moreparticularly, the disclosed system and method relate to a pipeconnection that enables both the pipe and fitting joints to deflectrelative to one another.

BACKGROUND

Polyvinyl chloride (“PVC”) pipes are frequently used in buriedapplications for carrying water and waste water and are typically buriedbetween 2 and 4 feet beneath the surface, although such pipes may alsobe buried between 15 and 20 feet beneath the surface. In buriedapplications, ground movement is usually minor especially in areas withminimal seismic activity. However, ground movement can be extreme inareas experiencing frequent and violent seismic activity as well asareas that experience dramatic expansion and contraction, e.g., coastalareas and areas in which the ground is predominantly clay or soilsdescribed as expansive.

There are two things can happen when there is ground movement. One isjoint separation, and the second is pipe shear and ultimate failure.There are multiple products on the market today called joint restraint.These products are assembled externally by mechanical means over thepipe bells eliminating joint separation. However, once assembled theseproducts do not allow for deflection so problems still exist with pipeshearing and failures when there is ground movement.

SUMMARY

In some embodiments, a system includes a conduit and a gasket assembly.The conduit includes a body and has a bell defining an opening disposedat one end of the conduit. The bell includes a ridge defining acircumferential internal groove, a sloping portion defining an internalrecessed area and disposed adjacent to the ridge, and an abutment endinwardly extending from the sloping portion in a direction that isperpendicular to a central axis defined by the bell. The gasket assemblyis disposed within the internal groove. The gasket assembly includes aplurality of gripping inserts each comprising a hollow body and anelastomeric gasket having a circular shape and being disposed within thehollow bodies defines by the plurality of gripping inserts.

In some embodiments, a system includes a conduit and a gasket assembly.The conduit includes a body and a bell defining an opening disposed atone end of the conduit. The bell includes a ridge defining acircumferential internal groove, a sloping portion defining an internalrecessed area and disposed adjacent to the ridge, and an abutment endinwardly extending from the sloping portion in a direction that isperpendicular to a central axis defined by the bell. The gasket assemblyis sized and configured to be received within the internal groovedefined by the bell of the conduit. The gasket assembly includes aplurality of gripping inserts each comprising a hollow body and anelastomeric gasket having a circular shape and being disposed within thehollow bodies defines by the plurality of gripping inserts.

In some embodiments, a system includes a first conduit, a secondconduit, and a gasket assembly. The first conduit includes a spigot end.The second conduit includes an elongate body and a bell defining anopening disposed at one end of the second conduit. The bell includes aridge defining a circumferential internal groove, a sloping portiondefining an internal recessed area and disposed adjacent to the ridge,and an abutment end inwardly extending from the sloping portion in adirection that is perpendicular to a central axis defined by the bell.The gasket assembly is disposed within the internal groove. The gasketassembly includes a plurality of gripping inserts each comprising alower wall from which a plurality of teeth extend to contact the spigotend of the first conduit, a rear wall, and an upper wall that defines aninternal cavity with the lower and rear walls. An elastomeric gasket hasa circular shape and is at least partially disposed within the internalcavities of the plurality of gripping inserts. The gasket assemblysecures the spigot end of the first conduit within the bell of thesecond conduit.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an isometric view of a pair of conduits to be connectedtogether in accordance with some embodiments.

FIG. 2 is a cross-sectional view of the conduits illustrated in FIG. 1.

FIG. 3 is a detail view of the bell and gasket assembly illustrated inFIG. 2.

FIG. 4 is a plan view of one example of a gasket assembly in accordancewith some embodiments.

FIG. 5 is a side view of the gasket assembly illustrated in FIG. 4.

FIG. 6A is a cross-sectional view of the gasket taken along line 6A-6Ain FIG. 5.

FIG. 6B is a cross-sectional view of the gasket taken along line 6B-6Bin FIG. 5.

FIG. 7 is a cross-sectional view of a two-material gasket in accordancewith some embodiments.

FIG. 8 is a cross-sectional view of another example of a two-materialgasket in accordance with some embodiments.

FIG. 9 is a cross-sectional view of a gasket in accordance with someembodiments.

FIG. 10 is a bottom-side isometric view of one example of a grippinginsert in accordance with some embodiments.

FIG. 11 is a bottom-side plan view of the gripping insert illustrated inFIG. 10 in accordance with some embodiments.

FIG. 12 is a cross-sectional view of a gripping insert in accordancewith some embodiments taken along line 12-12 in FIG. 11.

FIG. 13 is a front-side plan view of the gripping insert illustrated inFIG. 10 in accordance with some embodiments.

FIG. 14 is a cross-sectional view of a gripping insert in accordancewith FIG. 10 coupled to a gasket in accordance with some embodiments.

FIG. 15 is a bottom-side isometric view of another example of a grippinginsert in accordance with some embodiments.

FIG. 16 is a rear-side isometric view of the gripping insert illustratedin FIG. 15.

FIG. 17 is a front-side plan view of the gripping insert illustrated inFIG. 15.

FIG. 18 is a cross-sectional view of the gripping insert taken alongline 18-18 in FIG. 17.

FIG. 19 is a top-side plan view of the gripping insert illustrated inFIG. 15.

FIG. 20 is a rear-side plan view of the gripping insert illustrated inFIG. 15.

FIG. 21 is an isometric side view of another example of a grippinginsert in accordance with some embodiments.

FIG. 22 is a cross-sectional view of the gripping insert illustrated inFIG. 21 taken along line 22-22 in FIG. 21.

FIG. 23 is an isometric side view of another example of a grippinginsert in accordance with some embodiments.

FIG. 24 is a cross-sectional view of the gripping insert illustrated inFIG. 23 taken along line 24-24 in FIG. 23.

FIG. 25 is a cross-sectional view of one example of a pair of conduitsbeing connected in accordance with some embodiments.

FIG. 26 is a cross-sectional view of one example of a first conduitbeing fully seated within a second conduit in accordance with someembodiments.

FIG. 27 is a cross-sectional view of one example of a pair of connectedconduits under internal pressure in accordance with some embodiments.

FIG. 28 is a cross-sectional view of one example of a pair of connectedconduits with one conduit being deflected relative to the other conduitin accordance with some embodiments.

DETAILED DESCRIPTION

This description is intended to be read in connection with theaccompanying drawings, which are to be considered part of the entirewritten description. The drawing figures are not necessarily to scaleand certain features may be shown exaggerated in scale or in somewhatschematic form in the interest of clarity and conciseness.

In the description, relative terms such as “horizontal,” “vertical,”“up,” “down,” “top” and “bottom” as well as derivatives thereof (e.g.,“horizontally,” “downwardly,” “upwardly,” etc.) should be construed torefer to the orientation as then described or as shown in the drawingfigure under discussion. These relative terms are for convenience ofdescription and normally are not intended to require a particularorientation. Terms including “inwardly” versus “outwardly,”“longitudinal” versus “lateral” and the like are to be interpretedrelative to one another or relative to an axis of elongation, or an axisor center of rotation, as appropriate. Terms concerning attachments,coupling and the like, such as “connected” and “interconnected,” referto a relationship wherein structures are secured or attached to oneanother either directly or indirectly through intervening structures, aswell as both movable or rigid attachments or relationships, unlessexpressly described otherwise. When only a single machine isillustrated, the term “machine” shall also be taken to include anycollection of machines that individually or jointly execute a set (ormultiple sets) of instructions to perform any one or more of themethodologies discussed herein. The term “operatively connected” is suchan attachment, coupling or connection that allows the pertinentstructures to operate as intended by virtue of that relationship. In theclaims, means-plus-function clauses, if used, are intended to cover thestructures described, suggested, or rendered obvious by the writtendescription or drawings for performing the recited function, includingnot only structural equivalents but also equivalent structures.

The disclosed systems and methods for connecting conduits, e.g., pipesand/or fittings, advantageously provides a pipe joint or a fitting jointthat permits deflection up to and beyond five degrees in a singledirection and up to and exceeding ten degrees in multiple directions.Furthermore, the system can be used with polyvinyl chloride (“PVC”)pipes thereby enabling PVC pipes to be used in coastal areas, areassusceptible to frequent and extreme seismic activity, and areassusceptible to significant soil expansion and contraction, e.g., claysoil areas. The disclosed system can also be used in horizontaldirectional drilling operations as the system actuates in fluid and dryapplications as described in greater detail below.

FIG. 1 illustrates a pair of conduits 10, 100, such as a pipe orfitting, that are to be connected using the novel system disclosedherein. In some embodiments, conduits 10 and 100 are fabricated fromPVC, although conduits 10, 100 may be fabricated from other materialsincluding, but not limited to, polyethylene, polypropylene, or a ferrousmetal. Examples of ferrous metals include, for example, ductile iron.Conduit 10 includes a male or spigot end 12 that is to be receivedwithin female bell end 102 of conduit 100. Bell 102 is outwardly flaredfrom the remaining length 104 of conduit 100 and includes acircumferential ridge 106 that is disposed along the length of bell 102.Ridge 106 is disposed adjacent to open end 108 of conduit 100. As willbe understood by one of ordinary skill in the art, the internal diameterof bell 102 is greater than an external diameter of spigot end 12 ofconduit 10.

As best seen in FIG. 2, which is a cross-sectional view of bell 102 inwhich gasket assembly 132 is disposed, the outer lip 110 of open end istapered with respect to a central axis, A, defined by conduit 100. Forexample, outer lip 110 is tapered such that the outer edge 112 has agreater diameter than inner edge 114. In some embodiments, the taper ofouter lip 110 is five degrees with respect to the central axis, A,defined by bell 102 of conduit 100; however, one of ordinary skill inthe art will understand that the taper of outer lip 110 may be greateror less than five degrees. For example, the taper on outer lip can bewithin the range of one to ten degrees.

Referring to FIGS. 2 and 3, ridge 106 includes a forward portion 107that angles radially away from inner edge 114 of outer lip 110 and alsoincludes a rear portion 120 that defines an internal groove 116 incombination with forward portion 107 that is sized and configured toreceive gasket assembly 132, which is described in greater detail below.In some embodiments, forward portion 107 of ridge 106 extends away fromouter lip 110 at an angle of approximately 20 degrees with respect tothe central axis, A, defined by bell 102 of conduit 100. One of ordinaryskill in the art will understand that forward portion 107 of ridge 106may angle away from outer lip 110 at angles greater than or less than 20degrees. In some embodiments, for example, the range of angles isbetween 15 and 20 degrees, and more preferably between 16 and 18degrees. As best seen in FIG. 3, a small notch 118 is defined at theinterface between inner edge 114 of outer lip 110 and internal surface106 a of ridge 106. Notch 118 functions to act as a stop for gasketassembly 132 as described in greater detail below.

Rear portion 120 of ridge 106 angles away from the apex 122 of ridgewhere it terminates at valley 124, which is disposed between ridge 106and sloping portion 126 of bell 102 that angles away from valley 124until it terminates at abutment end 128 of bell 102. Sloping portion 126in combination with valley 124 and abutment end 128, defines a recessedarea 130 that enables relative movement between pipes 10 and 100 asdescribed in greater detail below. Internal surface 128 a of abutmentend 128 inwardly extends from sloping portion 126 such that internalsurface 128 a is approximately perpendicular to central axis, A, definedby pipe 100.

Gasket assembly 132 is now described with reference to FIGS. 4-19.Referring first to FIGS. 4-6B, gasket assembly 132 includes a gasket 134with a plurality of integrally formed gripping inserts 136. Gasket 134has a circular shape defining a ring. As will be understood by one ofordinary skill in the art, gasket 134 is formed from an elastomericmaterial such as, for example, styrene-butadiene rubber (“SBR”), anethylene-propylene-diene monomer (“EDPM”) rubber, nitrile rubber,plastic or other suitable material and combinations therefor. Forexample, gasket 132 can be formed of rubber having two differentdurometers as described in greater detail below. In some embodimentsthat are described in greater detail below, gasket 132 is a composite ofrubber and plastic materials.

As best seen in FIGS. 6A and 6B, trailing end 136 of gasket 134 includesa pair of divergent legs 138, 140 extending from body 142. In someembodiments, the angle β between divergent legs 138, 140 isapproximately 110 degrees. In some embodiments, the angle β betweendivergent legs 138, 140 is greater than or less than 110 degrees. Uppersurface 144 of body 142 tapers towards front end 146, and bottom surface148 provides a flat 150 along a portion of its length.

FIG. 7 illustrates an embodiment in which body 142 of gasket 134includes a first portion 142 a and a second portion 142 b. In someembodiments, portions 142 a and 142 b are both formed from rubber, butthe durometer of portion 142 a is less than the durometer of portion 142b such that portion 142 a forms a sealing portion and portion 142 bforms a rigid gripping portion. In some embodiments, portion 142 a isformed from rubber and portion 142 is formed from a plastic or othermaterial.

The gasket may have other shapes such as the shape illustrated in FIGS.8 and 9. As shown in FIGS. 8 and 9, gasket 234 includes a pair ofdivergent legs 238 and 240 and a body 242. Upper forward surface 244angles towards the front of gasket 234. In the embodiment illustrated inFIG. 8, gasket 234 includes first and second portions 242 a, 242 b. Insome embodiments, portion 242 a is formed from rubber having a firstdurometer and portion 242 b is formed from rubber having a seconddurometer that is greater than the first durometer. In some embodiments,portion 242 a is formed from rubber and portion 242 b is formed from aplastic or other rigid material. In the embodiment illustrated in FIG.9, gasket 234 is formed from a single material.

FIGS. 10-14 provide various views of one example one of the plurality ofgripping inserts 36, which includes a body 52 that curves along itslength. The curvature of body 52 is complementary to the curvature ofspigot end 12 of pipe 10. As best seen in FIG. 12, which is a sectionalview of gripping insert 36 taken along line 12-12 in FIG. 11, body 52has a triangular cross-sectional shape as defined by upper wall 54 andlower wall 56. Upper wall 54 and lower wall 56 diverge from one anotherat a non-perpendicular angle in some embodiments. For example, in someembodiments, the angle between walls 54 and 56 is complementary to theangle at which ridge angles away from the central axis, A, defined bybell 102 of pipe 100.

One or more teeth 60 extend from upper wall 54 and lower wall 56 and areconfigured to bite into the outer surface of male pipe 10 to preventseparate of pipe 10 and pipe 100 once pipes 10, 100 are engaged with oneanother. In some embodiments, such as the embodiment illustrated inFIGS. 12 and 14, teeth 60 extend parallel to one another along thelength of gripping insert 36. In some embodiments, teeth 60 have adifferent configuration such as, for example, an interruptedconfiguration in which teeth 60 do not extend the entire length of body52 or have a non-parallel configuration.

Each tooth 60 includes a rear surface 62 that is approximatelyorthogonal to lower wall 56 and a forward surface 64 that extendstowards lower wall 56 at a non-orthogonal angle such that a point 66 isformed between rear surface 62 and forward surface 64. In someembodiments, the angle between rear surface 62 and forward surface 64 is45 degrees; however, one of ordinary skill in the art will understandthat the angle between rear surface 62 and forward surface 64 can begreater or less than 45 degrees. The length of rear surface 62, i.e.,the height of a tooth 60, may be varied. In some embodiments, forexample, the teeth 60 of a gripping insert 36 used with a high-densitypolyethylene (“HDPE”) pipe is longer than the teeth 60 of a grippinginsert 36 used with an IPS pipe.

In some embodiments, such as the embodiment illustrated in FIGS. 12 and14, the forward surface 164 of the foremost tooth 60 is extended to theforemost tip 68 of gripping insert 36 such that the leading end 70 ofgripping insert 36 includes an angled surface. Gripping insert 36 ishollow with opposed sides 72, 74 defining respective openings 76, 78that communicate with channel 80.

In some embodiments, gripping inserts 36 are formed from a rigid metal,such as steel, by an investment casting process. In some embodiments,gripping inserts 36 are formed from another material such as, forexample, a plastic, such as an engineered plastic, or a ceramicmaterial. Gripping inserts 36 are joined to gasket 134 by injectionmolding the gasket material into a mold in which gripping inserts 36 aredisposed.

The hollow structure of gripping inserts 36 advantageously enablesgripping inserts 36 to be integrally formed with gasket 134 without theuse of primers or adhesives as the injection molded gasket materialflows through openings 76, 78 and within channel 80 to secure grippinginserts 36 to gasket 134. The resultant structure of gasket assembly 132prevents gasket 134 from blowing out when subjected to high pressures(e.g., pressures at or around 755 psi) when fully deflected.Additionally, the hollow design of gripping inserts 136 reduces theoverall weight of gasket assembly 132.

FIGS. 15-20 provide various views of another example one of theplurality of gripping inserts 136. Referring first to FIGS. 15-17,gripping insert 136 includes a body 152 that curves along its length.The curvature of body 152 is complementary to the curvature of spigotend 12 of pipe 10. As best seen in FIG. 18, which is a sectional view ofgripping insert 136 taken along line 18-18 in FIG. 17, body 152 has atriangular cross-sectional shape as defined by upper wall 154, lowerwall 156, and rear wall 158. Lower wall 156 and rear wall 158orthogonally extend from one another, and upper wall 154 extends fromlower wall 156 at an angle that is complementary to the angle at whichridge angles away from the central axis, A, defined by bell 102 of pipe100.

One or more teeth 160 extend from lower wall 156 and are configured tobite into the outer surface of male pipe 10 to prevent separate of pipe10 and pipe 100 once pipes 10, 100 are engaged with one another. In someembodiments, such as the embodiment illustrated in FIGS. 15, 16, and 18,teeth 160 extend parallel to one another along the length of grippinginsert 136. In some embodiments, teeth 160 have a differentconfiguration such as, for example, an interrupted configuration inwhich teeth 160 do not extend the entire length of body 152 or have anon-parallel configuration.

Each tooth 160 includes a rear surface 162 that is orthogonal to lowerwall 156 and a forward surface 164 that extends towards lower wall 156at a non-orthogonal angle such that a point 166 is formed between rearsurface 162 and forward surface 164. In some embodiments, the anglebetween rear surface 162 and forward surface 164 is 45 degrees; however,one of ordinary skill in the art will understand that the angle betweenrear surface 162 and forward surface 164 can be greater or less than 45degrees. The length of rear surface 162, i.e., the height of a tooth160, may be varied. In some embodiments, for example, the teeth 160 of agripping insert 136 used with a high-density polyethylene (“HDPE”) pipeis longer than the teeth 160 of a gripping insert 136 used with an IPSpipe.

In some embodiments, such as the embodiment illustrated in FIGS. 15, 16,and 18, the forward surface 164 of the foremost tooth 160 is extended tothe foremost tip 168 of gripping insert 136 such that the leading end170 of gripping insert 136 includes an angled surface. The angledsurface of leading end 170 facilitates engagement of gasket assembly 132and spigot end 12 of pipe 10 as described in greater detail below.

Gripping insert 136 is hollow with opposed sides 172, 174 definingrespective openings 176, 178 that communicate with internal chamber 180.As best seen in FIG. 20, rear wall 158 defines a pair of adjacentwindows 182, 184 each of which communicate with internal chamber 180.Disposed between adjacent windows 182, 184 is a reinforcing rib 186 thatextends between upper wall 154 and lower wall 156. In some embodiments,gripping insert 136 includes more than two windows 182, 184 and a singlereinforcing rib 186.

In some embodiments, gripping inserts 136 are formed from a rigid metal,such as steel, by an investment casting process. In some embodiments,gripping inserts 136 are formed from another material such as, forexample, a plastic, such as an engineered plastic, or a ceramicmaterial. Gripping inserts 136 are joined to gasket 134 by injectionmolding the gasket material into a mold in which gripping inserts 136are disposed.

The hollow structure of gripping inserts 136 advantageously enablesgripping inserts 136 to be integrally formed with gasket 134 without theuse of primers or adhesives as the injection molded gasket materialflows through openings 176, 178 and windows 182, 184 and within internalchamber 180 to secure gripping inserts 136 to gasket 134. The resultantstructure of gasket assembly 132 prevents gasket 134 from blowing outwhen subjected to high pressures (e.g., pressures at or around 755 psi)when fully deflected. Additionally, the hollow design of grippinginserts 136 reduces the overall weight of gasket assembly 132.

Another embodiment of a gripping insert 236 is illustrated in FIGS. 21and 22. As shown in FIGS. 21 and 22, gripping insert 236 includes teeth260 extending from both the lower wall 256 and upper wall 254.Structural features of gripping insert 236 illustrated in FIGS. 21 and22 that are similar or identical to structural features of grippinginsert 136 illustrated in FIGS. 15-20 have the same reference numeralincreased by 100. Descriptions of like features are not repeated. Insome embodiments, gripping inserts 236 are used with conduits havingbells, such as pipe bells or fitting bells, that are fabricated from PVCor other materials that is softer than a metal to provide enhancedgripping and prevent the gasket assembly from blowing out of itsengagement with the bell.

FIGS. 23 and 24 illustrate an embodiment in which gripping insert 336has a solid-body construction. Again, the structural features ofgripping insert 236 illustrated in FIGS. 16 and 17 that are similar oridentical to structural features of gripping insert 136 illustrated inFIGS. 15-20 have the same reference numeral increased by 200.Descriptions of like features are not repeated. Gripping insert 336 isconnected to gasket 134 by injection molding as described in U.S. Pat.No. 8,235,427 in the name of Jones et al., the entirety of which isherein incorporated by reference.

Once fabricated, gasket assembly 132 is installed within internal groove116 defined by ridge 106 by compressing and inserting gasket assembly132 into open end 108 of pipe 100. Gasket assembly 132 is inserted intoconduit 100 until gasket assembly aligns with ridge 106 and is receivedwithin internal groove 116.

Conduit 10 is joined to conduit 100 by inserting spigot end 12 into openend 108 of conduit 100 until spigot end contacts leading end 170 of oneor more gripping inserts 136 as illustrated in FIG. 20. Pressurecontinues to be applied to conduit 10 along the central axis, A, definedby conduit 100 causing gripping inserts 136 to be forced radiallyoutward causing gasket 134 to radially expand such that conduit 10 isreceived within central aperture 186 defined by gasket 134. Conduit 10continues to be advanced axially relative to pipe 100 until front faceof spigot end 12 of conduit 10 contacts abutment end 128 of bell 102 asillustrated in FIG. 26.

Gasket assembly 132 slides along the outer surface 14 of pipe 10 as pipe10 is advanced into bell 102. The relative movement between gasketassembly 132 and conduit 10 as conduit 10 is axially advanced intoconduit 100 is facilitated by angled teeth 160 that enable conduit 10 tobe received within central aperture 186 due to their angled geometry andby divergent legs 138, 140 contacting internal surface 126 a of slopingportion 126 of ridge 106 that acts as a stop for gasket assembly 132. Atthis point, the joint between the conduits is actuated.

The joint between conduits 10 and 100 provided by the geometry of bell102 and configuration of gasket assembly 132 enables conduit 10 todeflect up to and beyond five degrees relative to pipe 100 while at thesame time preventing blow-outs while under high pressures. Theseadvantages will be apparent as the operation of the joint is describedwith reference to FIGS. 26-28.

Gasket assembly 132 provides a liquid-tight seal between bell 102 ofconduit 100 and spigot end 12 of conduit 10 when assembled regardless ofwhether a fluid, such as water, is flowing through conduits 10, 100 oronly air is disposed within conduits 10, 100. The dimensions andconfiguration of internal groove 116 enable gasket assembly 132 to“float” depending on the amount of pressure to which conduits 10 and 100are subjected unlike with conventional bell configurations. For example,gasket assembly 132 maintains conduits 10 and 100 at a first position inwhich gasket assembly 132 is approximately centered within internalgroove 116 when the pressure within conduits 10 and 100 is a low orstandard pressure, e.g., 70-150 psi, as illustrated in FIG. 26. As thepressure within conduits 10 and 100 increases, gasket 132 and bell 102enable relative axial movement between conduits 10 and 100 as conduit 10moves away from conduit 100.

The relative movement between conduit 10 and 100 is provided by gasketassembly being moved towards open end 108 of bell 102 resulting in uppersurface 144 of gasket 132 and upper wall 154 of gripping inserts 136 tobe forced into contact with internal surface 107 a of forward portion107 of ridge 106 as illustrated in FIG. 27. Teeth 160 of clampinginserts 136 are pressed into further engagement with the outer surface14 of pipe 10 as the pressure builds within conduits 10 and 100 andupper surface 144 of gasket 132 and upper wall 154 of gripping inserts136 are pressed against the internal surface 107 a of forward portion107 of ridge 106. The disclosed joint has been fabricated using PVC forconduits 10 and 100 and subjected to internal pressures up to andexceeding 755 psi without failing. Some conduits and gaskets inaccordance with the present disclosure have been tested and have notfailed when deflected and subjected to pressures of 850 psi.

In addition to being able withstand high internal pressures whenconduits 10 and 100 are linearly aligned with one another, bell 102 andgasket assembly 132 enable conduits 10 and 100 to withstand highinternal pressures while being deflected up to five degrees relative toone another. FIG. 28 illustrates conduit 10 being deflected relative toconduit 100. As shown in FIG. 28, a first portion 16 of outer surface 14of conduit 10 is in contact and flush with a portion of outer lip 110.Another portion 18 of outer surface 14 of conduit 10, which is disposedon the opposite side of conduit 10, is in contact with internal surface126 a of sloping portion 126 of bell 102. In this manner, the angle ofouter lip 110 and angle of sloping portion 126 enable conduit 10 to bedeflected relative to conduit 100.

Gasket assembly 132 maintains a fluid-tight seal even when conduit 10 isdeflected relative to conduit 100. For example, the disclosed joint wasfabricated using PVC for conduits 10 and 100 as described above and wastested under a high-pressure while one conduit was deflected by morethan five degrees relative to the other conduit. The conduit wassubjected to an internal pressure of 760 psi for more than five minuteswhile deflected and did not fail.

As described above, the disclosed conduit connecting systemadvantageously enables deflection between two conduits of up to andbeyond five degrees in a single direction and ten degrees in multipledirections. Furthermore, the system can be used with conduits fabricatedfrom PVC, HDPE, and ductile iron thereby enabling conduits to be used incoastal areas, areas susceptible to frequent and extreme seismicactivity, and areas susceptible to significant expansion and contractionwith less likelihood of failure. Additionally, the disclosed conduitsystem can be utilized in horizontal direction drilling operations asthe joint is actuated upon engagement of the gasket assembly on an innerconduit and does not rely on the presence of an elevated (i.e., greaterthan atmospheric) internal pressure.

These advantages are attributable to the coupling between theelastomeric gasket and the gripping inserts or segments. The angling ofthe segments enables a pipe spigot to be inserted into the bell andautomatically engage. The engagement is strong such that the pipe orfitting cannot be easily separated. When pressure is added, the fluidactivates the gasket by pushing the gasket into the annular groove andincrease the securement of the restraint mechanism. Additionally, thegasket is configured to engage without internal pressure or in a dryapplication. In some embodiments, teeth on the gripping segments engagethe mating pipe both on the inner diameter and on the outer diameter ofthe pipe or bell.

Although the system and method have been described in terms of exemplaryembodiments, they are not limited thereto. Rather, the appended claimsshould be construed broadly, to include other variants and embodimentsof the system and method, which may be made by those skilled in the artwithout departing from the scope and range of equivalents of the systemand method.

What is claimed is:
 1. A system, comprising: a conduit comprising a bodyand a bell defining an opening disposed at one end of the conduit, thebell including a ridge defining a circumferential internal groove, asloping portion defining an internal recessed area and disposed adjacentto the ridge, and an abutment end inwardly extending from the slopingportion in a direction that is perpendicular to a central axis definedby the bell; and a gasket assembly disposed within the internal groove,the gasket assembly including a plurality of gripping inserts eachcomprising a hollow body, and an elastomeric gasket having a circularshape and being disposed within the hollow bodies defines by theplurality of gripping inserts.
 2. The system of claim 1, wherein thebell includes a tapered outer lip that inwardly extends from an outeredge to an inner edge.
 3. The system of claim 2, wherein an anglebetween the tapered outer lip and the central axis defined by the bellis five degrees.
 4. The system of claim 1, wherein a valley is disposedbetween the ridge and the sloping portion, the valley having an diameterthat is smaller than an internal diameters of the ridge and the slopingportion.
 5. The system of claim 4, wherein the sloping portion outwardlyextends from the valley at an angle of five degrees with respect to thecentral axis defined by the bell.
 6. The system of claim 1, wherein eachgripping insert includes a plurality of teeth outwardly extending from alower wall that extends in a lengthwise direction.
 7. The system ofclaim 6, wherein each gripping insert includes a rear wall and an upperwall extending from the lower wall and defining an internal chamber. 8.The system of claim 7, wherein the rear wall defines at least one windowin communication with internal chamber, the at least one windowreceiving at least portion of the gasket therethrough.
 9. The system ofclaim 7, wherein each gripping insert includes a pair of opposed endseach defining a respective opening in which at least a portion of thegasket is received.
 10. A system, comprising: a conduit comprising abody and a bell defining an opening disposed at one end of the conduit,the bell including a ridge defining a circumferential internal groove, asloping portion defining an internal recessed area and disposed adjacentto the ridge, and an abutment end inwardly extending from the slopingportion in a direction that is perpendicular to a central axis definedby the bell; and a gasket assembly sized and configured to be receivedwithin the internal groove defined by the bell of the pipe, the gasketassembly including a plurality of gripping inserts each comprising ahollow body, and an elastomeric gasket having a circular shape and beingdisposed within the hollow bodies defines by the plurality of grippinginserts.
 11. The system of claim 10, wherein the bell includes a taperedouter lip that inwardly extends from an outer edge to an inner edge. 12.The system of claim 11, wherein an angle between the tapered outer lipand the central axis defined by the bell is five degrees.
 13. The systemof claim 10, wherein a valley is disposed between the ridge and thesloping portion, the valley having an diameter that is smaller than aninternal diameters of the ridge and the sloping portion.
 14. The systemof claim 13, wherein the sloping portion outwardly extends from thevalley at an angle of five degrees with respect to the central axisdefined by the bell.
 15. The system of claim 10, wherein each grippinginsert includes a plurality of teeth outwardly extending from a lowerwall that extends in a lengthwise direction.
 16. The system of claim 15,wherein each gripping insert includes a rear wall and an upper wallextending from the lower wall and defining an internal chamber.
 17. Thesystem of claim 16, wherein the rear wall defines at least one window incommunication with internal chamber, the at least one window receivingat least portion of the gasket therethrough.
 18. The system of claim 16,wherein each gripping insert includes a pair of opposed ends eachdefining a respective opening in which at least a portion of the gasketis received.
 19. A system, comprising: a first conduit including aspigot end; a second conduit comprising a body and a bell defining anopening disposed at one end of the second conduit, the bell including aridge defining a circumferential internal groove, a sloping portiondefining an internal recessed area and disposed adjacent to the ridge,and an abutment end inwardly extending from the sloping portion in adirection that is perpendicular to a central axis defined by the bell;and a gasket assembly disposed within the internal groove, the gasketassembly including a plurality of gripping inserts each comprising alower wall from which a plurality of teeth extend to contact the spigotend of the first pipe, a rear wall, and an upper wall that defines aninternal cavity with the lower and rear walls; and an elastomeric gaskethaving a circular shape and being at least partially disposed within theinternal cavities of the plurality of gripping inserts, wherein thegasket assembly secures the spigot end of the first conduit within thebell of the second conduit.
 20. The system of claim 19, wherein the bellincludes a tapered outer lip that inwardly extends from an outer edge toan inner edge, the tapered lip being disposed at an angle of fivedegrees relative to the central axis defined by the bell.